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The Long Baseline Neutrino Facility (LBNF) will produce the worlds mostintense neutrino beam. Three series connected magnetic horns will require 5kV,300kA, 800$\mu$s pulses at a rate of 0.7Hz to focus the beam. Fermilab hasdesigned and built pulsed high current supplies for horns in the past. Pulsedcurrents of 205 kA for Neutrinos at Main Injector (NuMI - NOvA), focusing a 120GeV beam, and 170 kA for Booster Neutrino Beam (BNB - MiniBooNE) for focusingan 8 GeV beam have been operational for about 18 years. While the magnetichorns are expected to be replaced, the LBNF horn power supply is expected tolast the lifetime of the project, 30 years. A resonant, half sine wave pulserwas used for NuMI and BNB and has many practical advantages. The system hasimpedance limited fault currents by design, albeit large ones. That along withthe resonant behavior means that thyristor switches are well suited. Many faultmodes of the system have also been calculated. Several circuit changes wereincorporated so that a single fault can be tolerated. The supply must bereversable to enable both neutrinos and anti-neutrinos to be produced. Thesereversal requirements required a significant amount of mechanical design andconsideration to allow for quick reversal of all the semiconductors.

A 300 kA Pulsed Power Supply for LBNF